Chase Bank is the bank that operates all the ATMs in guest areas. Partners Federal Credit Union operates the ATMs in backstage areas.
In the area, there are also branches for 5/3, Bank of America, Regions, and Wells Fargo. I don't live near CP housing, and don't know what is easily accessible using CP transportation, so my recommendations probably aren't all that useful, but I've been very happy with Regions bank, and not so happy with Partners Credit Union.